I agreed big dog must be leashed. Earth is supposed to be meant for all species. Human have alreadi took and modernised most part of it. Where can the animals like dogs and cats go. I agreed it a playground meant for children, not dog. Dog owners must have the responsibility to leash their big dogs. (i meant those real big ones)
From,
http://www.ava.gov.sg/NR/rdonlyres/0CA18578-7610-4917-BB67-C7DF4B96504B/17971/ABDogLicensingandControlRules2007.pdf, i think the rule is not just big dogs.
All dogs needs to be on a leash and under the owner's control. In addition, German Shepherd and Doberman Pinscher, among others, need to be muzzled
Regarding "Earth is supposed to be meant for all species", Dogs are descended from wolfs, and domesticated by Man. The different breeds, small miniature sized, huge dogs with huge jaws, etc, are made by Man, to work for Man, and for entertainment and companionship. i.e. fulfill the needs of Man. Dogs are part of "Human modernisation of the world"
http://en.wikipedia.org/wiki/Dogs has a reference for an estimate of 400 Million Dogs in the world.
If you look at the number of dogs being left with SPCA,
http://www.spca.org.sg/dump.html, there is an "excess". Majority of these dogs are probably "euthanized", another word for killed but in as painless and dignified manner as possible. Because there is no way to care for them otherwise.
3,002 dogs (half of them pedigree), left with SPCA in 2007. Quote from the SPCA webpage
: "This is an alarming figure, and proofs that owners were simply not ready for the commitment of owning a dog."